mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 144

• Manufacturer Part Number: mc68hc08az60
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

Monitor ROM (MON)
Entering Monitor
Mode
MC68HC08AZ60 — Rev 1.0
144
NOTE:
Table 1
Enter monitor mode by either
Once out of reset, the MCU waits for the host to send eight security bytes
(see
break signal (10 consecutive logic 0s) to the host computer, indicating
that it is ready to receive a command.
Monitor mode uses alternate vectors for reset, SWI, and break interrupt.
The alternate vectors are in the $FE page instead of the $FF page and
allow code execution from the internal monitor firmware instead of user
code. The COP module is disabled in monitor mode as long as V
5.0 Volt DC Electrical Characteristics
either the IRQ pin or the RESET pin. (See
System Integration Module (SIM)
modes of operation).
Holding the PTC3 pin low when entering monitor mode causes a bypass
of a divide-by-two stage at the oscillator. The CGMOUT frequency is
equal to the CGMXCLK frequency, and the OSC1 input directly
generates internal bus clocks. In this case, the OSC1 signal must have
a 50% duty cycle at maximum bus frequency.
1. For V
Maximum Ratings
Freescale Semiconductor, Inc.
•
•
V
V
HI
HI
For More Information On This Product,
Security
(1)
(1)
Executing a software interrupt instruction (SWI) or
Applying a logic 0 and then a logic 1 to the RST pin.
HI
shows the pin conditions for entering monitor mode.
,
5.0 Volt DC Electrical Characteristics
1
1
Go to: www.freescale.com
on page 151). After the security bytes, the MCU sends a
0
0
Monitor ROM (MON)
1
1
on page 408.
1
0
Table 1. Mode Selection
Monitor
Monitor
Mode
CGMXCLK
---------------------------- -
on page 83 for more information on
2
on page 410), is applied to
CGMXCLK
CGMOUT
or
CGMVCLK
---------------------------- -
on page 410, and
2
Frequency
MOTOROLA
CGMOUT
------------------------- -
CGMOUT
------------------------- -
Bus
HI
2
2
(see
4-mon